Apparatus for drying liquid or pulpy material



W. SASSE Oct. 13, 1931.

APPARATUS FOR DRYING LIQUID OR PULP! MATERIAL Filed July 28. 1928 2 Sheets-Sheet 1 fnvenfar Wham/S255 5 a Zilarnegs Oct. 13, 1931. w. SASSE 1,827,517

APPARATUS FOR DRYING LIQUID OR PULPY MATERIAL Filed July 28, 1928 2 Sheets-Sheet 2 In v enZar fi ilke w sasse,

Patented Oct. 13, 1931 UNITED STATES PATENT OFFICE WILHELM SASSE, F CHABLOTTENBURG,'GERMANY Application filed July 28, 1928, Serial No.

My invention relates to improvements in apparatus for drying liquid or pulpy material, and more particularly in apparatus of the type comprising an internally heated '5 rotary drum and rollers for distributing the material to be dried on the said drum. 'Aparatus of this class are used for example in the manufacture of dye-stuffs for drying the said dye-stuffs. In apparatus of this type such as are now in use all the rollers for supplying the material from a receptacle are in contact with the heated drum, so that the material is partly dried before being applied to the drum, the heat from the drum being transmitted through the feed rollers to the material contained within the receptacle. Therefore special cooling means are needed for reducing the temperature. Further, the feed rollers must be made from wood soaked with fat, in order to prevent stickin of the material on the said rollers. The 0 je'ct of the improvements is to provide an apparatus of the class indicated in which transmission of heat from the drum to the material contained within the receptacle is avoided, and with this object in view my invention consists in employing unheated feed rollers disposed in series, one of the said rollers being in contact with the heated drum, while the other roller is out of contact with the drum and makes contact only with thefirst-n amed roller and with the material contained within the receptacle. Hereinafter the roller making contact with the drum will be termed the applying roller, while the second roller will be termed the feed roller. When thus constructing the apparatus the transmission of.heat from the drum to the material contained with- -.-in the receptacle and to the feed roller is avoided, and further, the material does not stick to the feed roller.

Another object of the improvements is to provide an apparatus in which the pressure of the applying roller on the drum can be regulated, so that the operation, and more particularly the thickness of the layer of material applied to the drum can be varied according to the character of the material to be dried. For thus regulating the pressure 59 of the applying roller on the drum the said 295,934, and in Germany August 8, 1 927.

applying roller and the feed roller are mounted on a rockable frame controlled by weighted bodies, sprin s or the like for regulating the pressure of the applying roller on the drum.

For the purpose of explaining the invention two examples embodying the same have been shown in the accompanying drawings in which the same reference characters have been used in all the views to indicate corresponding parts. In said drawings,

Fig. 1 is a diagrammatlcal elevation of the apparatus,

Fig. 2 is a similar elevation showing a modification, and

Fig. 3 is an elevation looking from the right in Fig. 1.

In the example shown in Figs. 1 and 3, the apparatus consists of a drum a mounted on frames 7' and adapted to be rotated in the direction of the arrow at by suitable means such as a worm gearing i, the said drum being adapted to be internally heated by suitable means. In the example shown'in the figures, the hollow drum 0 is closed at both ends, and steam admitted to the hollow shaft through a pipe k is delivered from the shaft into the hollow drum 0, and discharged at the opposite end of the drum through the shaft and a pipe On the frames 9' a frame (1 is rockingly mounted at f, and the said frame is suspended at its free end by means of a ro e m trained on a roller n and carrying weig ted bodies g. On the frame (I an unheated applying roller 6 is loosel mounted, which is in surface contact with the drum 0. Further, on the frame d an unheated feed roller a is loosely mounted which is in surface contact with, or in peripheral transferring relation to, the ap lying roller 5, and which is partly immersed into a preferably stationary receptacle e adapted to contain the material to be dried. As appears from Fig, 1, the roller a is out of contact with the drum 0, so that, owing to the fact that the rollers a, 6, act as heat insulators, the heat of the drum is not transmitted to the material contained within the receptacle 6 and cooling means for the said receptacle may be dispensed with. By reason of the surface contact of the drum 0 and the rollers b and a, 100

. fectell lfi isalsodesl rota y movement is imparted to the said roll ers from the drum 0, the direction of the rotation of the rollers bein indicated bythe arrows 3 and z respective y. 5 As appears from Fig. 1, the bearings of the feed roller a' are adjustably mounted on brackets o, and screws p enable the said bearings', together with the roller a,.to be adjusted toward and from the applying roller 6. Thus the operation of the apparatus can be adapted to the character of the material, since the adjustment of the roller a towardor from the'roller b also varies the depth to which said roller (1 dips into the material in the receptacle 0. By means of the weighted bodies 9 thepressure of the roller b on the drum o and. the thickness of the layer of the material applied to the drum can be regulated. The bodily adjustment of the, feed roller (1 is efin a direction inclined to the horizontal, and varies the depth to which the said roller dips into the material contained in the receptacle e, at the same time with a variation of the distance between the contacting 85 or adjoining portions of the rollers a, b. At.

the beginning of the operation that is tosay before the feed roller a has begun to trans fer material to the'applying roller 6, the roller a will beadjusted to actual contact with the roller 6, so as to be driven by the latter when the drum 0 rotates the roller 6 by surface contact. As soon as a coat or film of material passes from the feed roller a to the applying roller 6, such feed roller will .35 be adjusted away from the applying roller,

a distance or gap corresponding to the thick- -ness of such film, and from that time on, the -roller a will be rotated, not by direct contact with the roller 6, but by the adhesion or drag of the film which-the rotation of the roller b is transferring from the feed roller a to the drum' 0. It'will be noted that with the par-- jticular' adjustment illustrated, whenever the gap between the rollers a, b is increased by moving the roller an away from the roller 6, the depth to which the feed roller a dips into the material contained in the receptacle 0 is increased correspondingly, .and similarly, adjustment of the roller (1 in a direction to decrease the gap will at the same time decr'easethe depth of immersion of the feed roller a.'- This is an important advantage, since the width ofthe gap between the roll- I ers a, 6 determines the amount of material which is to be transferred to the drum 0 per second or other unit of time, and it will be obvious that the picking up of a greater amount of material by the roller a will require such rollerto dip more deeply into the material than when a smaller amount of the same'material is to be 'picked up, as is the case when the roller ads adjusted relatively close to the roller 6. In addition to this, the ability tow. the immersion of the rollera 'rzble for the "following reasons:

eaner? The amount of material picked up and conveyed by the rollers "a, b will also depend on the consistency of the material contained in the receptacle 0. The more viscous this material, or in other words, the less moisture or liquid it contains, the more readily will it adhere to the rollers. Therefore, if the material contains but little liquid and is correspondingly viscous or sticky, a slight depth of immersion will suflicefor the feed roller a; on the other hand, if the material contains ,agreat pro: portion of liquid and thus flows readil it will not adhere so well to the rollers,an the roller a will have to be adjusted to a greater depth of immersion in order that it -may pick up therequisite amount of material.

For removing thedriedmaterial from the drum 0 a scraper h is provided.

In the-operation of the apparatus the feed.

roller a takes the material'to be dried from the receptacle 6, and. transfers a suitable thickness of the material to the rollerb whereupon the material is transferred to the drum c. The dried material is removed from the drum 0 in the form of powder by means of the scraper k.

- The construction shown in Fig. 2 is similarto the one illustrated in Fig. 1, and similar letters of reference have been used to indi-.

cate corresponding parts. 'However, the

frame 03 the rollers n and the weighted bodies 9 are mounted so that the weighted bodies tend to move the roller b away from the drum c, the said roller bein held in contact withthe drum 0 by the unba anced weight of the frame (2 and the parts mounted thereon. By removing one or more Weighted bodies 9 the pressure of the roller 12 on the drum 0 is increased, and vice versa.

By'disposingthe feed roller (1 and the applying roller 6 in series, so that only the applying, roller b makes contact with the drum 0, the transmission of heat from the drum 0 to the feed roller a and the material contained within the rece tacle e is avoided. By means of the weights bodies 9 or g the pressure of the roller 6 on the drum 0 and the thickness of the layer of the material applied to the drum 0. can be regulated. Should a hard object get between the roller. 1) and the drum 0, the framed or al will automatically yield, so that any injury to the machine is avoided.

' While in describing the invention referencehas been made to particular examples embodying the same Iwish it to be under-,

stood that my invention is not limited to the constructions shown in the drawings, and

that various changes may be made in the gen- I drum, heating means for sai drum, an aping the material to be dried to said feed ro a rockable frame on which said applying roller and feed roller are mounted, and a lurality of weighted bodies acting on said ame. and tending to elevate the same and to press the applying roller against the drum.

2. drying apparatus, comprising a rotary drum, heating means for said drum, an applying roller in surface contact with said drum, a feed roller in peripheral transferring relation to said up lying roller and out of contact with said drum, means for appllya rockable frame on which said applying roller and feed rollers are mounted, said frame being located above said drum and so that the applying roller bears on the drum by gravity of the frame and the parts mounted thereon, and weighted bodies acting on 1 said frame and adapted to reduce the pressure of the applying roller on'the drum.

3. A drying apparatus, comprising a rotary drum, heating means for said drum, an

roll applying roller in surface contact with said drum, a feed roller in peripheral transferring relation to saidapplying roller and out of contact with the drum, means for applying the material to bedried to said feed roller, said feed roller insulating said material ap plyingmeans from the drum,-and means for vary ng the distance between the feed roller 4. A drying apparatus, comprising a rotary drum, heating means for said drum, an applying roller in surface contact with said drum, a feed roller in peripheral transferring relation to said applying roller and out of contact with said drum, and a receptacle for the material to be dried, said feed roller ex- (1 tending into said receptacle, and being adjustable relatively thereto to vary the depth to whlich such'feed roller dips into said materia 51. Adrying apparatus, comprising arotary drum, heating means for said drum, an applyingroller in surface contact with said drum, a feed roller in peripheral transferring relation to said applying roller and out of contact with said drum,and a receptacle for the material to be dried, said feed roller extending into said receptacle, and being adjustable relatively thereto in a direction which varies the depth to which said feed roller dips into said material and simultaneously varies the distance between thesaid ers.

6. A drying apparatus, comprising a rotary heating means for said drum, an I gpplymg roller in surface contact with said )ielation to said ..applying roller and out of uni-,a feed roller in peripheral transferring contact with said drum, and a receptacle for the material to be dried, said feed roller extending into said receptacle to dip into the material therein and being adjustable relatively to said receptacle in a direction inclined to the horizontal.

7. A drying apparatus comprising a rotary drum, heating means for said drum, an applying roller in surface contact with said drum, a feed roller in peripheral transferring relation to said applying roller and out of contact with said drum, means for applying the material to be dried, to said feed roller, a rockable frame on which said applying roller and said feed roller are mounted, and weighted bodies acting on said frame to control the pressure with which the applying roller bears against the drum.

8. A drying apparatus, comprising a rotary drum, means for heating said drum, an unheated applying roller in surface contact with said drum, an unheated feed roller in peripheral transferring relation to said applying roller but out of contact with said drum, so as to insulate said feed roller against the direct transmission of heat from the drum, and means for applying the material to be dried, to said feed roller, at a'point away from the applying roller and from the drum, whereby both the feed roller and the applying roller will be interposed in sequence between the material-applying means and the drum so that the insulating properties of said rollers will be added to each other to prevent the transfer of heat from the drum to the material-applying means.

9. A drying apparatus, comprising a rotary drum, means for heating said drum, an unheated applying roller in surface contact with said drum, an unheated feed roller in peripheral transferring relation to said applying roller but out of contact with said rum, so as to insulate said feed roller against the direct transmission of heat from the drum, means for applying the material to be dried, to said feed roller, at a point away from the applying roller and from the drum, whereby both the feed roller and the apply ing roller will be'interposed in sequence between the material-applying means and the drum so that the insulating properties of said rollers will be added to each other to prevent the transfer of heat from the drum to the material-applying means, and means for varying the pressure with which said applying roller bears against the drum.

10. A drying apparatus, comprising a rotary drum, heating means for said drum, an applying roller in surface contact with said drum, a feed roller in peripheral transferring relation to said applying roller but out of 'contact with said drum. so as to insulate said adjustable toward and from the applying 2:

roller, to vary the distenee between the axes of said rollers, and means for applying the material to be dried, to said feed roller-, at a point away from the applying roller and from the drum whereby both the feed roller and the applymg roller will be interposed in sequence between the materiel-applying means and the drum so that the insulating properties of said rollers will be added to each other to prevent the transfer of heat from the drum $0 the meterial-epplying means.

In testimony whereof, K have signed this specificetiono WHELM SASSE.

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